DC HOUSE 12V 12Ah LiFePO4 Lithium Battery with 15A BMS, 10 Year Lifespan,10000+ Cycles, for Marine, Ride on Toy, Trolling Motor Fish Finder, Kayak, Power Wheels, Pride Go Go Mobility Scooters

Got the 12V/12Ah/154Wh version quickly, safely packaged, and all is as it should be. Not too large or heavy; it can be taken on a walk.It was pre-charged at perhaps 50% and works well with a transceiver that draws 6 Amps max, ca 450mA when receiving only.I recharged the battery with a bench power supply that supports CV&CC mode as required.DISCLAIMER: It is strongly discouraged to use anything else but a dedicated battery charger with appropriate settings to charge Lithium batteries. If improperly handled these batteries can get damaged or destroyed, and in the worst case they can explode into a difficult to extinguish massive fire.The battery specs claim C=12A and a standard charging current of 6A at 14.2-14.6V. To start on the safe side I set the power supply to 14.2V/2A or C/6. At 2A and 13-14V the battery gets charged at 26-28W which predicts a charging time of around 6h given a capacity of 154Wh.The picture shows a charging diagram (upper left). All looks as expected. There are plenty similar diagrams available on the internet for LiFePo batteries. The battery did not get warm (22C room temperature), but the power supply, rated 300W, switched the fan on every 5 minutes for 5-10 seconds. Nothing to worry about.The upper right plot shows a discharge curve when powering the receiver at an estimated 450-550mA, which is what the receiver draws when powered by the bench power supply (which displays the current). 500mA would be C/24 implying a total discharge time of 24hours at that load. The battery was probably only charged to about 95% and gets discharged to about 15%, a difference of 80%, in a little more than 1400 minutes = 24 hours in total. That might suggest an up to 20% higher capacity than the specs claim, but much of this discrepancy is likely due to an overestimated discharge current.The lower left plot is for a second charge of the battery at 14.6V / 6A = C/2 from around 15% to close to 100% - the internal safety circuits (BMS) switched the charging off at the end. The charging time is a little short of 2 hours as expected.The lower right plot is a second discharge curve using the same receiver as before. The initial sharp drop is common when discharging LiFePo batteries the first five or so percent down from 100% to 95%; this time the battery discharged in a bit more than 24 hours down to a level between 15 and 20%.Whereas it is difficult to determine the precise charging level from the measured voltages in the flat regions, it is easy to detect the much sharper transitions from steep to flat in the charge and discharge curves. These can be used to restrict charge/discharge ranges to ~80% only, which is often claimed to prolong life of LiFePo batteries. However, every few times these batteries must be charged full in order to trigger the internal balancing processes.Somebody mentioned in a different review their battery gave up after 6 charges. That may have been a dud or the BMS somehow got triggered and the battery is just sleeping now. Some battery chargers have a wake-up mode. For me, so far everything seems fine.For outdoor activities and carrying the battery in a backpack, the terminals of the battery are too exposed - I'll have to build some caps to avoid accidental shortcuts. The connectors can also be mixed up easily - adding 10 to 20 Amp diodes in the charging and power cables will make sense to avoid accidental wrong polarities.

Item as described,well packaged and delivered as their instructions advised. Best regards and thank you, J. B. Symington.

Working well after 8-10 charges so far

Just what we needed and a quick delivery.

Replaced the car type batteries in mobility scooter and gives good boost to performance and range from previous batteries. Left outside in big storage unit oct -march and still had charge .

Dead after 5 cycles, unbelievable

Replaced the heavy lead batteries in my mobility scooter. So much lighter and easier. I've also ordered a 20ah battery box and the 30ah mini battery's which will upgrade the range drastically. I'll put a review for them once it's arrived and fitted.So far so good

Functionality:I bought a pair of these for a small mobility scooter to act as backup for the 10A gel cells when the wife was out and about. Turns out they gave up around 75% of the normal range. I'm not saying these batteries are bad but high current draws will cause severe voltage drop which either because of BMS characteristics or appliance protection circuits can mean grinding to a halt even with decent capacity remaining. I'm sure 20A+ would have been a better choice for my application.